<!DOCTYPE html>
<html>

<head>
    <title></title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="../bootstrap-5.1.3-dist/css/bootstrap.css" rel="stylesheet">
    <script src="../bootstrap-5.1.3-dist/js/bootstrap.bundle.min.js"></script>
</head>

<body class="container">
    <h3>默认对齐(左对齐)</h3>
    <div>
        <div class="spinner-border"></div>
    </div>
    <hr />
    <h3 align="center">居中对齐</h3>
    <div class="text-center">
        <div class="spinner-border"></div>
    </div>
    <hr />
    <h3 align="right">居右对齐</h3>
    <div class="text-end">
        <div class="spinner-border"></div>
    </div>

</body>

</html>